Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 12 of 12 for “"wrist posture"”.
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Evaluation of wrist posture during the operation of four electromechanical mice
… height, mouse type, and hand length on the wrist posture of computer mouse operators. Mouse support height was defined as the distance from the floor to the horizontal surface on which the mouse is supported and divided into three levels: 95%, 100%, and 105% of the seated elbow height. The …
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Initial wrist posture during typing as a function of keyboard height and slope
… for this problem are repetition and awkward wrist postures. This experiment examined wrist flexion-extension, radial-ulnar deviation, and pronation-supination for 24 righthanded subjects at 25 combinations of keyboard height and slope. Keyboard heights tested were: -10, -5, 0, 5, and 10 cm …
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Wrist posture during computer mouse usage: the effects of wrist support and surface height
… the effects that mouse surface height and wrist support have on wrist posture. Distance between targets and target width were varied to determine performance time and performance accuracy throughout the conditions. Results showed that the presence of a wrist support decreased wrist …
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The effects of keyboard height, wrist support and keying time on wrist posture and trapezius EMG during keyboarding
… of keyboard height, the presence or absence of a wrist support, and keying time on different risk factors associated with musculoskeletal disorders experienced by VDT operators. Measurements of wrist posture, activity of the trapezius muscles, shoulder abduction and typing performance were …
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Effects of negatively sloped keyboard wedges on user performance and perceptions
… keyboard slopes on forearm muscle activity, wrist posture, key strike force, perceived discomfort, and performance to identify a negative keyboard angle or range of keyboard angles that minimizes exposure to hypothesized risk factors for hand/wrist work related musculoskeletal disorders. Ten …
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Effects of cinematic factors on the perception of wrist postures when viewed on a video display
… choices on people’s ability to judge the posture of the wrist from video images. Deviated wrist postures, which are associated with the performance of many tasks, have been reported to play a role in hand and arm discomfort and in a variety of disorders. The goal of this study was to gain …
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Effects of Time Pressure and Mental Workload on Physiological Risk Factors for Upper Extremity Musculoskeletal Disorders While Typing
… and physiological reactions of the lower arm and wrist during typing activity by measuring muscle activation patterns, wrist posture and movement, key strike forces, and subjective assessments of overall workload. The results indicate that increases in time pressure lead to increases in lower arm …
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Pneumatic ergonomic crutches
… hyperextension and ulnar deviation of the wrist, and excessive palmar pressure compressing the median nerve associated with crutch walking have reported to cause discomfort, joint pain, wrist strain, carpal tunnel syndrome and other serious injuries. To address these issues, we developed …
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Assessment of ergonomics risk factor associated with upper limb disorders among cashiers in grocery retail industries
… limbs mostly due to risk factors such as awkward postures, repetition motion and forceful exertions. The aim of this study was to identify the disability level of upper limb disorders (ULDs) and risk factors involved among 136 cashiers in grocery retail industries using Disabilities of the Arm, …
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An evaluation of a supermarket bagging task using a wrist motion monitor
… objective of this study was to quantify the wrist motions required to bag groceries. Subjects participated in the laboratory or in the supermarket. The wrist motions included wrist deviations, velocities, and accelerations for flexion-extension, radial-ulnar, and pronation-supination …
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Modeling and design of fiber reinforced pneumatic actuators for soft robotics applications
… to the forearm, thereby reducing the risk of wrist injury as well as improving the wrist posture. The second application is of a pipe climbing soft robot that uses bending and extending type actuators to generate motion on the outside of a pipe. This robot can have applications in nuclear and …
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Determining Upper Extremity Posture Using a Simplified Marker Configuration for Biomechanical Risk Evaluation during Tool Use
<p>Representing upper extremity posture has posed a great challenge in the field of analytical biomechanics due to their great freedom of motion, which allows for large rotations in multiple directions. The Euler and quaternion methods, which are two commonly used methods for describing joint …